Lac Viennaux is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 58° 35' 49'' North   (decimal: 58.5968755)
• Longitude: 71° 16' 56'' West   (decimal: -71.2821320)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Viennaux
• GPS Coordinate Locator Map: Lac Viennaux Lat/Long